================================================================== BUG: KASAN: use-after-free in dev_map_flush_old kernel/bpf/devmap.c:389 [inline] BUG: KASAN: use-after-free in __dev_map_entry_free+0x2a9/0x330 kernel/bpf/devmap.c:403 Read of size 8 at addr ffff88806b34f388 by task syz-executor.4/28193 CPU: 1 PID: 28193 Comm: syz-executor.4 Not tainted 5.0.0+ #60 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 lib/dump_stack.c:113 print_address_description.cold+0x7c/0x20d mm/kasan/report.c:187 kasan_report.cold+0x1b/0x40 mm/kasan/report.c:317 __asan_report_load8_noabort+0x14/0x20 mm/kasan/generic_report.c:135 dev_map_flush_old kernel/bpf/devmap.c:389 [inline] __dev_map_entry_free+0x2a9/0x330 kernel/bpf/devmap.c:403 __rcu_reclaim kernel/rcu/rcu.h:240 [inline] rcu_do_batch kernel/rcu/tree.c:2452 [inline] invoke_rcu_callbacks kernel/rcu/tree.c:2773 [inline] rcu_process_callbacks+0x928/0x1390 kernel/rcu/tree.c:2754 __do_softirq+0x266/0x95a kernel/softirq.c:292 invoke_softirq kernel/softirq.c:373 [inline] irq_exit+0x180/0x1d0 kernel/softirq.c:413 exiting_irq arch/x86/include/asm/apic.h:536 [inline] smp_apic_timer_interrupt+0x14a/0x570 arch/x86/kernel/apic/apic.c:1062 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:__sanitizer_cov_trace_const_cmp8+0x1/0x20 kernel/kcov.c:194 Code: ff 5d c3 66 0f 1f 44 00 00 55 89 f2 89 fe bf 05 00 00 00 48 89 e5 48 8b 4d 08 e8 ba fe ff ff 5d c3 0f 1f 84 00 00 00 00 00 55 <48> 89 f2 48 89 fe bf 07 00 00 00 48 89 e5 48 8b 4d 08 e8 98 fe ff RSP: 0018:ffff8880552afb40 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13 RAX: ffffc9000194f000 RBX: ffff888065490140 RCX: ffffffff861de7b0 RDX: 0000000000000000 RSI: ffffc9000194f000 RDI: fffffffffffff000 RBP: ffff8880552afcb0 R08: ffff8880552a6500 R09: ffff8880552a6da0 R10: 0000000000000000 R11: 0000000000000000 R12: 00000000fffffff5 R13: ffffc9000194f000 R14: ffff8880552afc88 R15: ffff888095847780 nf_sockopt net/netfilter/nf_sockopt.c:104 [inline] nf_getsockopt+0x80/0xe0 net/netfilter/nf_sockopt.c:122 ipv6_getsockopt net/ipv6/ipv6_sockglue.c:1402 [inline] ipv6_getsockopt+0x20b/0x290 net/ipv6/ipv6_sockglue.c:1382 tcp_getsockopt net/ipv4/tcp.c:3631 [inline] tcp_getsockopt+0x95/0xf0 net/ipv4/tcp.c:3625 sock_common_getsockopt+0x9a/0xe0 net/core/sock.c:3079 __sys_getsockopt+0x168/0x250 net/socket.c:1960 __do_sys_getsockopt net/socket.c:1971 [inline] __se_sys_getsockopt net/socket.c:1968 [inline] __x64_sys_getsockopt+0xbe/0x150 net/socket.c:1968 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe RIP: 0033:0x45aa5a Code: b8 34 01 00 00 0f 05 48 3d 01 f0 ff ff 0f 83 6d 8d fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 49 89 ca b8 37 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 4a 8d fb ff c3 66 0f 1f 84 00 00 00 00 00 RSP: 002b:00007ffc5ebcabb8 EFLAGS: 00000216 ORIG_RAX: 0000000000000037 RAX: ffffffffffffffda RBX: 00007ffc5ebcabe0 RCX: 000000000045aa5a RDX: 0000000000000041 RSI: 0000000000000029 RDI: 0000000000000003 RBP: 000000000070ecc0 R08: 00007ffc5ebcabdc R09: 0000000000004000 R10: 00007ffc5ebcace0 R11: 0000000000000216 R12: 0000000000000003 R13: 0000000000000000 R14: 0000000000000029 R15: 000000000070d1c0 Allocated by task 5055: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_kmalloc mm/kasan/common.c:495 [inline] __kasan_kmalloc.constprop.0+0xcf/0xe0 mm/kasan/common.c:468 kasan_kmalloc+0x9/0x10 mm/kasan/common.c:509 kmem_cache_alloc_trace+0x151/0x760 mm/slab.c:3615 kmalloc include/linux/slab.h:545 [inline] kzalloc include/linux/slab.h:740 [inline] dev_map_alloc kernel/bpf/devmap.c:102 [inline] dev_map_alloc+0x1be/0x6e0 kernel/bpf/devmap.c:88 find_and_alloc_map kernel/bpf/syscall.c:129 [inline] map_create kernel/bpf/syscall.c:526 [inline] __do_sys_bpf+0x97b/0x3eb0 kernel/bpf/syscall.c:2685 __se_sys_bpf kernel/bpf/syscall.c:2662 [inline] __x64_sys_bpf+0x73/0xb0 kernel/bpf/syscall.c:2662 do_syscall_64+0x103/0x610 arch/x86/entry/common.c:290 entry_SYSCALL_64_after_hwframe+0x49/0xbe Freed by task 7799: save_stack+0x45/0xd0 mm/kasan/common.c:73 set_track mm/kasan/common.c:85 [inline] __kasan_slab_free+0x102/0x150 mm/kasan/common.c:457 kasan_slab_free+0xe/0x10 mm/kasan/common.c:465 __cache_free mm/slab.c:3494 [inline] kfree+0xcf/0x230 mm/slab.c:3811 dev_map_free+0x43c/0x540 kernel/bpf/devmap.c:192 bpf_map_free_deferred+0xba/0xf0 kernel/bpf/syscall.c:290 process_one_work+0x98e/0x1790 kernel/workqueue.c:2173 worker_thread+0x98/0xe40 kernel/workqueue.c:2319 kthread+0x357/0x430 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 The buggy address belongs to the object at ffff88806b34f280 which belongs to the cache kmalloc-512 of size 512 The buggy address is located 264 bytes inside of 512-byte region [ffff88806b34f280, ffff88806b34f480) The buggy address belongs to the page: page:ffffea0001acd3c0 count:1 mapcount:0 mapping:ffff88812c3f0940 index:0x0 flags: 0x1fffc0000000200(slab) raw: 01fffc0000000200 ffffea0002415408 ffffea00022212c8 ffff88812c3f0940 raw: 0000000000000000 ffff88806b34f000 0000000100000006 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff88806b34f280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806b34f300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff88806b34f380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff88806b34f400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff88806b34f480: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc ==================================================================